The usual pronunciation of 'oo' is /uː/ or /ʊ/. The dieresis in the spelling coöperate emphasizes that the second o begins a separate syllable. However, the dieresis is becoming increasingly rare in US English typography, so the spelling cooperate predominates. See also Appendix:Dieresis.

Sentence Examples

The nature of their actions makes it absolutely imperative that they fully cooperate.

When he was eventually caught after he'd been committing identity theft for five years, he agreed to cooperate with the FBI and became a successful consultant advising businesses about how to protect themselves from this crime.

While anorexia is usually treated on an in-patient basis, bulimia and binge-eating may be treated on an out-patient basis if the victim is willing to cooperate with the treatment.

One of the most effective forms of support for kids of divorce occurs naturally when they see their parents cooperate with one another towards finding the best solution.

Families must cooperate together to accomplish goals and live peacefully, whether that cooperation is part of chore duties, household maintenance, saving money, or other family tasks.